BuddyPress.org

i removed this part:
RewriteBase /blog/
RewriteRule ^index.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]

but it still doesnt work, i mean, only when using blog.emailaya.com
i have another subdomain that links to another site and it works perfect. inside the relevant folder i have index.php that redirect to the other site so my conclusion is that something is wrong with index.php in the blog folder, ofcourse it doesnt explain why http://www.emailaya.com/blog does work.
what’s gone wrong?
thanks